Improper Input Validation vulnerability in Apache Tomcat. Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82, and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy.

Users are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-46589
• https://lists.apache.org/thread/0rqq6ktozqc42ro8hhxdmmdjm1k1tpxr
• http://www.openwall.com/lists/oss-security/2023/11/28/2
• apache/tomcat@6f181e1
• apache/tomcat@7a2d881
• apache/tomcat@aa92971
• apache/tomcat@b5776d7
• https://tomcat.apache.org/security-10.html
• https://tomcat.apache.org/security-11.html
• https://tomcat.apache.org/security-8.html
• https://tomcat.apache.org/security-9.html
• https://www.openwall.com/lists/oss-security/2023/11/28/2
• https://security.netapp.com/advisory/ntap-20231214-0009/
• https://lists.debian.org/debian-lts-announce/2024/01/msg00001.html